78000845 has 16 divisors (see below), whose sum is σ = 106732080. Its totient is φ = 54211584.

The previous prime is 78000841. The next prime is 78000859. The reversal of 78000845 is 54800087.

It can be written as a sum of positive squares in 8 ways, for example, as 4778596 + 73222249 = 2186^2 + 8557^2 .

It is a cyclic number.

It is not a de Polignac number, because 78000845 - 2² = 78000841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78000841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34190 + ... + 36399.

It is an arithmetic number, because the mean of its divisors is an integer number (6670755).

Almost surely, 2^78000845 is an apocalyptic number.

It is an amenable number.

78000845 is a deficient number, since it is larger than the sum of its proper divisors (28731235).

78000845 is a wasteful number, since it uses less digits than its factorization.

78000845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70624.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 78000845 is about 8831.8087049030. The cubic root of 78000845 is about 427.2674110687.

The spelling of 78000845 in words is "seventy-eight million, eight hundred forty-five", and thus it is an aban number.